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Comand to eliminate useless lines

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I can't remember the command to get rid on lines on top of lines. what i mean is i want to erase all but one line that are on top of each other. I have a drawing which is 20mb when it should be 1mb max, but it seems that the drawing is layered on top of its self 30+ times and zeroz so that I can not take them off from a different angle. any help would be appreciated.